The x402 API marketplace landscape.
Pay-per-call APIs are an emerging category — ~10 platforms exist today, all built on the x402 protocol backed by Coinbase, Stripe, and Adyen. Here's how Vend402 compares to every alternative.
| Platform | Network | Fee model | Focus | No account | No API key | Fiat | General APIs | Playground |
|---|---|---|---|---|---|---|---|---|
Vend402 You're here Pay-per-call APIs for autonomous agents. | Base (USDC) | Transparent flat | General-purpose APIs + agent UX | |||||
RelAI x402 marketplace for crypto-native devs. | Base (USDC) | Revenue share | Crypto-native providers | |||||
x402engine 88+ LLM APIs, agent-first. | Base (USDC) | Per-call markup | LLM / AI inference | |||||
Ping Pay Solana micro-API marketplace. | Solana (USDC) | Per-call markup | Solana ecosystem | |||||
SwarmApi Company intelligence for agents. | Base (USDC) | Per-call markup | Financial / EDGAR data | |||||
API Toll 402 protocol on Base & Solana. | Base + Solana | 3% platform fee | Provider tooling | |||||
PayAPI Market 97% rev share, no-code listing. | Base (USDC) | 3% platform fee | Indie providers | |||||
RapidAPI Legacy API marketplace (subscriptions). | Fiat (card) | 20% + subs | Enterprise / SaaS |
yes partial / roadmap no
Where Vend402 wins
Developer-first onboarding
Most x402 platforms assume you're already crypto-native. Vend402 has a hosted playground so any dev can hit an endpoint in 30 seconds without wiring a wallet first.
Broad API categories
Competitors focus on LLMs or crypto data. Vend402 catalogs general-purpose APIs — weather, FX, sentiment, WHOIS, scraping — the long tail real apps need.
Transparent ledger
Every paid call is logged to a public transactions table. Providers see real demand; buyers see real usage. No hidden routing.
Frequently asked
What is an x402 API marketplace?
A directory of HTTP endpoints that charge per call using the x402 protocol — an open standard backed by Coinbase, Stripe, and Adyen that uses the HTTP 402 Payment Required status code to settle micropayments in stablecoins like USDC on networks such as Base and Solana.
How is this different from RapidAPI?
RapidAPI requires monthly subscriptions, API keys, and account creation. Vend402 charges per individual call in USDC — no subscription, no account, no key. Any AI agent or app can call the endpoint, pay on the spot, and get a response.
Which pay-per-call API marketplace should I pick?
If you're building agents that need LLM access, x402engine and SwarmApi specialize there. If you're Solana-native, Ping Pay. If you're a provider chasing maximum revenue share, PayAPI Market. For general-purpose APIs and the smoothest dev experience, Vend402.
Start vending in minutes.
Browse the catalog, hit an endpoint from the playground, or list your own API and start earning per call.